var createError = require('http-errors');
var express = require('express');
var path = require('path');
var cookieParser = require('cookie-parser');
var logger = require('morgan');
var session = require("express-session")
var indexRouter = require('./routes/index');
var usersRouter = require('./routes/users');
var goodsRouter = require('./routes/goods');



var cors = require('cors');
var app = express();



// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'jade');

app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));
app.use(session({
  secret: "qwer",
  resave: false,
  saveUninitialized: true
}))

// 使用cors组件
app.use(cors());

app.all("*", function (req, res, next) {
  res.header("Access-Control-Allow-Headers","Access-Control-Allow-Origin")
  //设置允许跨域的域名，*代表允许任意域名跨域
  res.header("Access-Control-Allow-Origin", "*");
  //允许的header类型
  res.header("Access-Control-Allow-Headers", "content-type");
  //跨域允许的请求方式 
  res.header("Access-Control-Allow-Methods", "DELETE,PUT,POST,GET,OPTIONS");
  res.header("Access-Control-Allow-Headers", "X-Requested-With");
  res.header("X-Powered-By", ' 3.2.1')
  res.header("Content-Type", "application/json;charset=utf-8");
  next()
});

app.all('*', function (req, res, next) {
  console.log("调用了中间件")

  next();
});


app.use('/', indexRouter);
app.use('/users', usersRouter);
app.use('/goods', goodsRouter);
app.get('/')

// catch 404 and forward to error handler


// error handler
app.use(function (err, req, res, next) {
  // set locals, only providing error in development
  res.locals.message = err.message;
  res.locals.error = req.app.get('env') === 'development' ? err : {};

  // render the error page
  res.status(err.status || 500);
  res.render('error');
});

module.exports = app;
